# 求任意三个数的乘积
def multi(a, b, c):
    print(f"乘积:{a * b * c}")


# 根据不同用户显示不同欢迎信息
def welcome(username):
    print(f'欢迎{username}光临!')


# 定义函数,指定默认值
def function1(a=1, b=2, c=4):
    print(f'a={a}')
    print(f'b={b}')
    print(f'c={c}')


def function2(value):
    print(f'value={value}')


def function3(value):
    value[0] = 30
    print(f'value=', value, id(value))


function3([1, 2])
